you should process the file as soon as you upload it. The file is stored in a temporary location so by design it will only be available for a short while. As for your use-case - the user already clicked the upload button, why put another one in front of him?
Hello Michal, thank you for you answer. The app have a form with many fields, one of them is the fileUpload. The last button is a confirmation button, when the user confirm by pressing that button, the app process all data, including the file.
If the component was designed that way, I have to change it.
Ah, I see. Still, just save it to a less temporary file and when you submit the form use that file.